I’m literally turning it into the same aspect ratio as an ultra wide monitor so the question you’re asking applies to anyone who wants to use 21:9 aspect ratio over 16:9, you can just give it a try and see why we enjoy it
Read here for instructions https://www.reddit.com/r/pcmasterrace/comments/5avwkq/219_ultrawide_gaming_on_your_169_monitor/?utm_medium=android_app&utm_source=share